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I got a laptop with good battery life 8-9 hrs normal use and 11-12 at low brightness. But The time remaining estimate never shows higher than 10 hrs remaining. While the charge is above ~80% in low load conditions, the time remaining shows 10hrs. Once the true estimate is below 10hrs (when under load or below 75% battery) it is accurate. I'm seeing this same issue in KDE, gnome and xfce. And running the acpi command also yields the same result.
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